Discussion
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- Question
Gross and net calorific value of a fuel will be the same
Options- A. if its ash content is zero.
- B. ifits carbon content is very low.
- C. if its hydrogen/hydrogen compound content is zero.
- D. under no circumstances.
- Correct Answer
- if its hydrogen/hydrogen compound content is zero.
- 1. The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C.
Options- A. 100 to 150
- B. 350 to 450
- C. 550 to 650
- D. 700 to 850 Discuss
- 2. Which of the following gaseous fuels has the lowest calorific value?
Options- A. Gobar gas
- B. Refinery gas
- C. Converter gas
- D. Blast furnace gas Discuss
- 3. Yield of coke oven gas in low temperature carbonisation of coal is about __________ Nm3 /ton of dry coal.
Options- A. 60
- B. 160
- C. 500
- D. 750 Discuss
- 4. In high temperature carbonisation of coal compared to low temperature carbonisation
Options- A. yield of ammonia is less.
- B. aromatic content of tar is low.
- C. H2 content in the coke oven gas is more.
- D. calorific value of the coke oven gas is lower. Discuss
- 5. Pensky-Marten apparatus is used for those oils, whose flash points are __________ °F.
Options- A. <120
- B. >120
- C. <90
- D. 90-110 Discuss
- 6. The gas which contributes maximum to the heating value of natural gas is
Options- A. CO
- B. CO2
- C. H2
- D. CH4 Discuss
- 7. Low temperature carbonisation
Options- A. is mainly for producing the smokeless domestic coke.
- B. is meant for the production of 'metallurgical coke'.
- C. produces higher quantity of gas than high temperature carbonisation.
- D. produces less quantity of tar than high temperature carbonisation. Discuss
- 8. Presence of free moisture in coal during its high temperature carbonisation
Options- A. reduces the coking time.
- B. protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls.
- C. increases the loss of fine coal dust from the ovens when charging.
- D. none of these. Discuss
- 9. Natural draught produced by a chimney depends upon the
Options- A. density of the chimney gases.
- B. height of the chimney.
- C. both (a) and (b).
- D. neither (a) nor (b). Discuss
- 10. Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
Options- A. 1000
- B. 4000
- C. 6000
- D. 8000 Discuss
Fuels and Combustion problems
Search Results
Correct Answer: 350 to 450
Correct Answer: Blast furnace gas
Correct Answer: 160
Correct Answer: H2 content in the coke oven gas is more.
Correct Answer: >120
Correct Answer: CH4
Correct Answer: is mainly for producing the smokeless domestic coke.
Correct Answer: protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls.
Correct Answer: both (a) and (b).
Correct Answer: 4000
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